Expansible mold.



(LEU. MAGGARD.

. .EXPANSIBLE MOLD. Y

APPLICATION FILED hmmm. 1913.

1,0865379. I Petented Feb.10,1914. f/'egl- .T Wl

f? f :Die l e Y x 20 i 2 g 6 1% l ./22 2? ,2% e'ill u 1U LL Lussem CHARLES E. HAGGARD, or KANSAS crrY, MISSOURI.

EXPANSIBLE MOLD.

Specification of Letters Patent.

vApplin'zation led March 27, 1913. Serial No. 757,107,

Patented Feb. 10, 1914.

' -To all whom it may concern: I

Beit known that I, CHARLES E. MAGGAIm, a citizen of the United States, residing at Kansas City, inthe county of Jackson and State of. Missouri, have invented certain new and useful Improvements in Expan -produce a simply constructed device of this character, which may be readily expanded for different Sizes of culvert arches, and afterward collapsed for removal from the molded structure.v

Another'object is the provision of' means vwherebyv such .devices will be made more easily portable when in collapsed form.

my invention resides in various; details and peculiarities of construction, all as fully -illustrated and'described in the following Aspecification, taken in connection with the accompanying drawing, in which.l

- Figure 1, is a top plan view, partly broken away, of the steel frame work of my device fully expanded, and with the shell of cover 'plates removed; Fig. 2, is a bottom plan view of the main frame of the machine, with a pair of the expanding sections shown fully collapsed; and Fig. 3, is an end elevation of the device in expanded condition and the coverplates 'applied thereto.

Referring to the drawing, the main frame of the machine is 'constructed of angle iron bars 2, joined together and spaced a slight distance apart by crossbraces 4.- Between the opposite endsv of these bars and secured thereto are stationary brackets 6 provided with journal bearings for the opposite ends of a shaft 8, the terminals` of which are squared at 10, for engagement by a crank 12 at times when the shaft is to be turned. Mounted upon the shaft 8 is a series of sliding heads 14, 14, vand 16, 16, the heads 14, 14being threaded for engagement by the oppositely threaded ortions at the ,ends of said shaft, while t e heads 16, 16, are smoothbored for -free movement upon the plain middle portion of the shaft, and over the threaded portion.

Each of the sliding heads is provided with 'these'and other objects in view as will be seen in the course of the description,

a series of radially projecting pivot lugs 18, bored to receive pivot bolts or pins 20 on which to support for pivotal movement the series of arch bars 22. The uppermost and the lowermost of said lugs will each support a pair of such bars, each pair extending to practically the same point of the arch, whereby ,it will be 'seen that the extra support is afforded along the middle line of the arch and at the bottom margins of the sides, where additional strengthening is de sirable. The outer ends of these arch bars are pivotally joined to a series ofangle' bars 24. which are for the purpose of su porting the several cover plates 26 thatorm the outer shell of the core, which plates are folded along their upper edges into hook form for engagement with the bars 24, as shown clearly in Fig. 3. The plates 26 of each side of the arch engage each other slidingly, and are wide enough to maintain over-lappin contact even when the arch isA fully expan ed. The adjacent edges of the top plates 26 are joined by the same pivotal connections which unite the corresponding bars 24 with the middle bars 22.

In order that the heads 16 will move in unisonwith the heads 14, each head 16 is connectedwith the adjacent head 14 by a pair of bars 28.

It will now be understood that -as the shaft 8 is turned by means of the crank 12, the heads 14 will be moved either toward or from the ends of the shaft, and will correspondinglymove the heads 1.6, as a result of which the bars 22 and the parts supported thereby will be moved along lines extending radially outward or inward relatively to the shaft. Since the plates overlap and slide upon each other, t ey readily adapt themselves to the changing positions of the supporting bars, so that by proper manipu- 'lationof the crank 12, a shell may be ob 'tained of any desired radius, within the range provided for by the bars 22, which` arch bars l contemplate supplying in various lengths so as to give whatever range ofv adjustment may be required.

Secured beneath each of the brackets 6` is a plate 30, extending transversely of the main frame, and to the under face of each of these plates SO-is bolted a shaft 32 of a lengthV to carry a pair of wheels 34 spaced a art a distance sllghtly greater than the widt of said main frame. Having the `PIPPIrat-us thus mounted on wheels at each end will -features enumerated as desirable in the 2() of the appended claims. d

mounted on each end portion of the shaft greatly facilitate withdrawal of it from the molded culvert, and at the same time avoid subjecting the apparatus to the undue wear from scraping and jarring which arises from dragging it about instead of having it on wheels.

F or insuring tight lits betweenl the overlapping plates 26, irrespective of the radius of the mold, a plurality of wires 36 are banded around the mold, the ends .of the wires being preferably twisted together at 38 to hold the plates-Which are of spring metalf-,curved concentrically of the shaft 8; the wires being removed when the mold is collapsed.

From the foregoing it will be apparent that I havev produced an expansible core for concrete work possessing the advantageous statement of the object 'of the invention, and I Wish it to be understood that while I have illustrated and ydescribed one form of the invention, Ireserve. the right to make such changesas fall within the spirit and scope I claim; 1. In an expansible arch for culverts, a central frame, a shaft mounted thereon andend portion being oppositely threaded from the other -end portlon, a pair of heads and slidingly mounted on the' frame, one of each pair of heads being threaded to Acorrespend with the adjacent end ortion of the shaft and its companion hea being bored to move freely over said end portion, links connectin the heads of each pair whereby upon turni of the shaft each pair of heads will move 1n unison toward or from the other pair of heads, a series 'of plates forming an arch about'said frame as a center, and a series of linksfeonneetingaid-plates plates radially with reference to the frame as the heads are moved` Y I 2. In an expansblaarchlof culverts, a central frame, a series' of plates arranged in' substantially semi-circular form about said frame as a' center, said:l fra-me comprising a air of longitudinal bars connected by cross races, a pair of'sup orting wheels carried by each end of the game in the plane of the base of said arch, a ser-ies o f oppositely sliding heads lmounted on said. frame and a seriesv of oppositely swinging links connecting said heads to said plates and arranged to move the latter radially with reference to the frame as the heads are moved, and means carried by said frame for sliding said heads. L

'- 'In testimony'whereof, I aiix my signature, in the presence of two witnesses.

CHARLES E. MAGGARD.

Witnesses:

Cms. W. GERARD, G. Y. Tnonrn.

'to said heads .and iranged to move said 

